Accelerating ice loss from peripheral glaciers in North Greenland

In recent decades, Greenland's peripheral glaciers have experienced large-scale mass loss, resulting in a substantial contribution to sea-level rise. Only 4% of Greenland's ice cover are small peripheral glaciers that are distinct from the ice sheet proper. Despite comprising this relatively small area, these small peripheral glaciers are responsible for 11% of the ice loss associated with Greenland's recent sea-level rise contribution. Using the satellite laser platforms ICESat and ICESat-2, we estimate that ice loss from these Greenland glaciers increased from 27±6 Gt/yr (2003–2009) to 42±6 Gt/yr (2018–2021). Here, we provide the laser altimetry assessment of changing ice loss rates from Greenland peripheral glaciers that bridges both the ICESat and ICESat-2 periods of Feb 2003 – Dec 2021. We provide peripheral glaciers elevation changes including correction for firn compaction, elastic uplift rates from present-day mass changes, and long-term past ice changes (Glacial Isostatic Adjustment- GIA). We provide: (1) Mean elevation change rates of the Greenland peripheral glaciers during, Feb 2003 - Oct 2009, Oct 2008 - Apr 2019, and Oct 2018 – Dec 2021 obtained from ICESat and ICESat-2 data. The grid resolution is 500x500 meters. (2) Mean elastic uplift rates of the bedrock (in mm/yr) due to ice loss during, Feb 2003 - Oct 2009, Oct 2008 - Apr 2019, and Oct 2018 – Dec 2021. (3) Mean firn compaction rates in m/yr during, Feb 2003 - Oct 2009, Oct 2008 - Apr 2019, and Oct 2018 – Dec 2021. (4) Glacial Isostatic Adjustment- GIA rates in mm/yr from the GNET-GIA empirical model of Khan et al. (2016). (5) Time series of mean surface air temperature in degrees Celcius during May-September in north, northwest, southeast, southwest, and northwest Greenland from RACMO2.3p2.

近数十年来，格陵兰岛周边冰川经历了大规模物质亏损，对全球海平面上升作出了显著贡献。格陵兰岛冰盖总面积中，仅有4%为与冰盖主体（ice sheet proper）显著区分的周边小型冰川。尽管这类冰川占地面积相对有限，却承担了格陵兰岛近期海平面上升相关冰量损失的11%。
本研究借助卫星激光测高平台ICESat与ICESat-2，估算得到这类格陵兰周边冰川的冰量损失从2003–2009年的27±6 Gt/yr增长至2018–2021年的42±6 Gt/yr。本文提供覆盖2003年2月至2021年12月、衔接ICESat与ICESat-2两个观测时段的格陵兰周边冰川冰量损失速率变化的激光测高评估数据，包含已校正粒雪压实（firn compaction）、当前物质亏损引发的弹性隆升，以及长期古冰变化（冰川均衡调整，Glacial Isostatic Adjustment, GIA）影响的周边冰川高程变化数据。
本数据集具体涵盖以下内容：
1. 基于ICESat与ICESat-2数据计算得到的格陵兰周边冰川在2003年2月—2009年10月、2008年10月—2019年4月，以及2018年10月—2021年12月三个时段的平均高程变化速率，空间网格分辨率为500×500米；
2. 上述三个时段内，由冰量损失引发的基岩平均弹性隆升速率（单位：毫米/年）；
3. 上述三个时段内的平均粒雪压实速率（单位：米/年）；
4. 基于Khan等人(2016)提出的GNET-GIA经验模型得到的冰川均衡调整（GIA）速率（单位：毫米/年）；
5. 基于RACMO2.3p2数据集得到的格陵兰北部、西北部、东南部、西南部及西北部5—9月平均地表气温时间序列（单位：摄氏度）。